This document discusses how to configure SNMP logging on RHEL 7. It describes editing the SNMP daemon configuration file to set startup options like logging level and facility. It also provides instructions for starting, stopping, restarting, and checking the status of the SNMP daemon service using systemctl commands.

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Table of Contents
Overview.......................................................................................................................................................1
Applies To......................................................................................................................................................1
Pre-Requisites ...............................................................................................................................................1
SNMP Daemon – Configuration File .............................................................................................................1
SNMP Daemon – Configuration File – View..................................................................................................1
SNMP Daemon – Configuration File – Reconfiguration................................................................................2
SNMP Daemon – Startup Options.................................................................................................................4
Startup Options Purpose...........................................................................................................................5
Syslog Daemon Options............................................................................................................................5
Logging Facility Table................................................................................................................................6
SNMP Daemon Management .......................................................................................................................6
SNMP Daemon – Start ..............................................................................................................................7
SNMP Daemon – Stop...............................................................................................................................7
SNMP Daemon – Restart ..........................................................................................................................8
SNMP Daemon – Status............................................................................................................................8

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Overview
In this guide we will go over different SNMP logging facility configuration on a Linux based operating
system.
We will also go over different SNMPD startup options as per the business / IT Operations requirements.
We will also get to know as to how we can configure logging levels based on the “Logging Facility” and
when to utilize various SNMP daemon startup options.
Applies To
 Ubuntu
 RHEL 6.5
 RHEL 7
Pre-Requisites
 Net-SNMP packages is installed on the server.
SNMP Daemon – Configuration File
Listed below is the configuration file “snmpd.conf” location on different operating systems.
Operating System File Location
Ubuntu /etc/default/snmpd
RHEL / CentOS /etc/sysconfig/snmpd
SNMP Daemon – Configuration File – View
Once you configure the snmp daemon startup options you can also validate / view configuration by
running the below command;
On Ubuntu – run the command;
lsb_release -d
cat /etc/default/snmpd | grep SNMPDOPTS

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On RHEL / CentOS – run the command;
cat /etc/redhat-release
cat /etc/sysconfig/snmpd | grep OPTIONS
SNMP Daemon – Configuration File – Reconfiguration
In case the default / custom configuration file is missing or corrupted, you can recreate a new snmp.conf
configuration file; to reconfigure / re-create run the command below;
snmpconf

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With this command you can also reconfigure / create new configuration file(s); When you run the
command, it will read the current configuration file;
1. /etc/snmp/snmp.conf
2. /etc/snmp/snmpd.conf
3. /etc/snmp/snmptrapd.conf
Upon reconfiguring is done with “snmpconf” command; you can perform these actions;
 overwrite
 rename
 append
 skip

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SNMP Daemon – Startup Options
By default, SNMP daemon is started with the configuration file “/etc/default/snmpd”,
“/etc/sysconfig/snmp” in Ubuntu, RHEL OS respectively with startup options as below;
# RHEL OS
cat /etc/sysconfig/snmp
# OPTIONS="-LS0-6d"
# Ubuntu OS
cat /etc/default/snmpd
SNMPDOPTS='-Lsd -Lf /dev/null -u snmp -I -smux -p /var/run/snmpd.pid -g root 0.0.0.0'

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Startup Options Purpose
SNMP daemon startup attribute(s) purpose are shown below table.
Option Purpose
L Logging
S Syslog
D Daemon
-Ls Log messages via syslog
-Lf Log messages to the specified file
U User
I Initialize
smux SNMP Multiplexing Protocol (disabled by default)
P Process ID
G Group ID
Syslog Daemon Options
Syslog daemon startup can be configured with different options, few of them are listed in the below table;
Logging Options Purpose
-Lsd Log Syslog Daemon (default)
-LSwd or -Ls4d Log Syslog Warning Message
-LSed or -LS3d Log Syslog Error Message
-Lf /dev/null Redirect to Null file

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Logging Facility Table
Table below gives logging facility that can be configured.
Numeric
Value
Character
Value
Log Type Logging Scenario / Purpose
0 ! LOG_EMERG Emergencies – System is unusable
1 a LOG_ALERT Alerts – Immediate action needed
2 b LOG_CRIT Critical – Critical conditions
3 c LOG_ERR Errors – Error conditions
4 e LOG_WARNING Warnings – Warning conditions
5 n LOG_NOTICE Notifications – Informational messages
6 i LOG_INFO Informational – Normal but significant conditions
7 d LOG_DEBUG Debugging – Debugging messages
SNMP Daemon Management
To manage snmpd daemon, run the command based on the SysVinit or Service Manager enabled on the
server(s);
SysVinit Enabled OS Systemd Enabled OS
service snmpd start systemctl start snmpd
service snmpd stop systemctl stop snmpd
service snmpd restart systemctl restart snmpd

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SNMP Daemon – Start
To start the snmpd daemon, run the command;
systemctl start snmpd
SNMP Daemon – Stop
To stop the snmpd daemon, run the command;
systemctl stop snmpd

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SNMP Daemon – Restart
To restart the snmpd daemon, run the command;
systemctl restart snmpd
SNMP Daemon – Status
To know the status of snmpd daemon, run the command;
systemctl status snmpd